Idea
Idea noun - Something imagined or pictured in the mind.
Usage example: my idea of the perfect vacation spot is an uncrowded, unspoiled beach
Surmise is a synonym for idea in impression topic. In some cases you can use "Surmise" instead a noun "Idea", when it comes to topics like sense, estimate, guess.
Mutual synonyms
Both words in one sentence
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I have no idea what happened, and can only surmise the lava cannon backfired horribly.
Source: What Did I Do Last Night?
Cite this Source
Surmise and Idea. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/idea/surmise
Idea & Surmise. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/idea/surmise>.
Surmise or Idea. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/idea/surmise.
Google Ngram Viewer shows how "idea" and "surmise" have occurred on timeline